ES2477340T3 - Pneumatic hammer with assisted lifting - Google Patents

Abstract

A percussion tool with integrated motor and assisted lifting (1), comprising: an individual vertical body (10) comprising at least two integral longitudinal diameters, wherein a first integral longitudinal diameter is a percussion diameter (23) and in where a second integral longitudinal diameter is a first drive diameter (114); 1a percussion plunger (21) contained within the percussion diameter (23) of the individual vertical body (10); a work tool (14) attached to the bottom of the power-assisted lifting percussion tool (1); a first lift plunger (112) contained within the first activation diameter (114) of the individual vertical body (10) and dividing the first activation diameter (114) into an upper lift chamber (117) and a chamber (118 ) lower retraction; a first lift plunger rod (113) connected to the first lift plunger (112) and extending out of the first actuating diameter (114) through an opening in the lower retraction chamber (118) and extending out of the individual vertical body (10) through an opening in the individual vertical body (10), wherein the first rod (113) of the lifting plunger further comprises an outer end; a lifting foot (15) connected to the outer end of the first rod (113) of the lifting plunger; a control unit (51) comprising a directional control valve (310, 311, 312) having an on position and an off position; and characterized in that it has a means of retraction of the piston that provides a sustained force against the first lifting piston (112) in an upward direction when the control valve (310, 311, 312) is in the disconnected position and, therefore, it maintains the lifting foot (15) in a retracted position when the work tool (14) is engaged on a work surface; wherein the first rod (113) of the lift plunger extends when the control valve (310, 311, 312) is in the actuated position and thereby raises the work tool (14) from the work surface , and wherein the first rod (113) of the lift plunger retracts when the control valve (310, 311, 312) is subsequently placed in the off position and wherein the plunger retraction means comprises a device (111 ) retraction spring in the form of a compression spring or a tension spring, wherein the retraction device (111) is arranged at the first activation diameter (114).

Description

Technical field

The present invention relates to a motor percussion tool that contains a lifting mechanism

10 assisted to mitigate the physical demands for the operation of the heavy motor percussion tool and facilitate the lifting and removal of the percussion tool with motor from a work surface.

Background of the invention

15 A percussion tool with a portable motor such as a pneumatic hammer employs an anvil driven by a plunger with a reciprocating reciprocating motion that quickly and repeatedly strikes at the end of a part of the chisel and impels it to a work surface . Its effectiveness is based on the inertia of the mass of your body and the force of gravity is also necessary for the mass to come back into contact with the work surface after each stroke. For this reason, the percussion tool with motor is usually very heavy, typically has a

20 weight of approximately 27.2 kg to 45.4 kg (from 60 pounds to 100 pounds). During a routine operation, it is necessary for an operator to repeatedly lift and replace the heavy device for the next operation. When working with a tool of this weight, the operator has to withstand a great physical tension and, thus, cannot operate the pneumatic hammer for a prolonged period of time. In addition the part of the chisel often gets stuck in the material in which it is working and removing it requires a lot of effort, which

25 makes the operation even more physically demanding. Therefore, productivity is greatly reduced but also poses a great risk to the health of operators.

Various types of assisted lifting devices have been developed to reduce physical demands and facilitate lifting and removal of equipment. In US-2,622,562 granted to Longenecker a detachable assisted lifting device for a motorized percussion tool, such as a pneumatic demolition hammer, is described. The assisted lifting device is a hydraulic lifting jack that is controlled by a butterfly valve with an actuating lever adjacent to one of the handles of the motorized percussion tool. When the butterfly valve is engaged, the activation means is admitted to the lifting jack and provides force to lift the percussion tool with motor. When the butterfly valve is

35 disengaged, the pressure of the activation means is released, but the plunger of the lifting jack remains in contact with the work surface. No retractable mechanism is provided for the lifting jack plunger in the description. However, the plunger can be pushed back manually to a retracted position.

US-2,776,653 to Eaton describes an improvement in a pneumatic drill when connecting a pair of jacks

40 pneumatic elevators with a practically semicircular foot to engage a work surface to lift the pneumatic drill. A mechanism for retracting the lifting foot is also provided when the pneumatic drill returns to the working position.

In US 4,548,279 granted to Zaruba a demolition tool with an extractor for releasing a

45 stuck demolition tool. The extractor has a pneumatic cylinder with a lifting foot. No retractable mechanism for the plunger is provided in the description. The lifting foot is in continuous contact with the work surface. A flow control valve is provided to regulate the lifting speed.

A pneumatic lifting coupling for a pneumatic hammer is described in US 4,986,370 to Johnson.

50 that applies an ascending force to the pneumatic hammer. The lifting coupling is a cylinder with a lifting foot. The cylinder body is contained in a support housing that has a lifting plate with a guide bore and an adjustable chain for attaching a pneumatic hammer to the lifting plate. Once it has engaged, the lifting foot is in continuous contact with the work surface.

55 In US-6,050,345 granted to Jarvinen et al. An ergonomic tool that includes a pneumatic hammer and an assisted lifting mechanism is described. The assisted lifting mechanism contains a sliding frame with a lifting foot connected to the lower end and a plunger connected to the upper end. The plunger is connected directly to the upper body of the pneumatic hammer and does not move. The frame containing a rodless cylinder moves and provides a lifting force to lift the pneumatic hammer.

60 GB-941 548 A refers to a pickaxe or pneumatic drill with assisted lift according to the preamble of claim 1 which is pneumatically operated. The assisted lifting comprises a support that can be moved relatively with respect to the pickaxe or drill so that it engages with the piece, and that can exert a force on the piece that produces a reaction in the pickaxe or drill so that it removes its tool Of the piece.

GB-1 533 745 A describes a device to facilitate the transport of a portable tool with motor that has a work tool. The motor tool comprises at least one hydraulically actuated double acting piston-cylinder part so that, when it is being used, the piston can move in the direction of the work tool axis. Means are mounted that carry a drive wheel at the free end of a bar connected to the plunger. Gripping means and inlet means are provided for supplying liquid on each side of the plunger to effect a movement of the plunger to a retracted position in which, when it is being used, the work tool is projected in said direction beyond the wheel, and in an extended position in which the wheel projects in said direction beyond the work tool to allow the power tool to rotate.

More than a year ago, the present inventors described a prototype of an assisted lifting device for a motorized percussion tool, such as a pneumatic hammer. The assisted lifting device contains a double-acting cylinder with a lifting foot and a four-way directional control valve with five openings. The actuator cylinder and directional control valve come from commercial sources and are supplied as two separate parts. The directional control valve is mounted on the upper end of the cylinder using a mounting bracket and the foot is mounted on the lower end of the cylinder. Next, the assisted lifting device is fixed to the upper body of the pneumatic hammer using the same mounting bracket. When using a double-acting cylinder, the lifting foot can be retracted by redirecting the flow of compressed air from the upper chamber to the lower chamber to prevent damage to the assisted lifting device when the engine percussion tool is running. A significant limitation of this prototype is that the assisted lifting device is heavy since it has a total weight of more than 9.07 kg (20 pounds), which adds an additional unnecessary physical load to the operator.

However, all these previous assisted lifting devices are designed as a separate unit that must be fixed to the body of the percussion tool with motor. A disadvantage of such a design is that the assisted lifting device adds additional weight and the transport of a unit of these characteristics becomes problematic. One solution to reduce the total weight of the motorized percussion tool unit and the assisted lifting device is to integrate the assisted lifting device into the body of a motorized percussion tool. Therefore, the objective of the present invention is to provide a percussion tool with integrated motor with an assisted lifting mechanism.

Summary of the invention

In accordance with the present invention, a motorized percussion tool is provided containing a percussion mechanism and an assisted lifting mechanism with the features of independent claim 1 to reduce physical demands on its operation by facilitating the lifting and extraction of The percussion tool with motor. Typically, the motorized percussion tool is a T-shaped machine that has a vertical cylindrical body with two handles, two manual control levers along the top, and a work tool and a foot elevator at the bottom to engage with a work surface. The first manual lever is for controlling the operation of the percussion mechanism while the second manual lever is for manipulating the operation of the assisted lifting mechanism.

The percussion mechanism and the assisted lifting mechanism of the motorized percussion tool are integrated in the vertical cylindrical body of the motorized percussion tool. The percussion mechanism has a percussion cylinder that contains a plunger within an upper cylinder diameter and a sliding anvil that extends through the lower coaxial cylindrical diameter.

The work tool with the upper part housed within the diameter of the lower cylinder is immediately below the sliding anvil.

The assisted lifting mechanism contains at least one actuator cylinder with at least one lifting foot fixed to the outer end of the piston rod and a control unit comprising a directional control valve. The control unit is at the top of the vertical cylindrical body of the percussion tool while the elevator foot is at the bottom to engage the work surface. The directional control valve is operated using the manual control lever, preferably adjacent to one of the handles of the motorized percussion tool to simplify its operation.

The actuator cylinder of the assisted lifting mechanism is an individual activation cylinder with a retractable device, such as a regulating spring, in which the lower retractable chamber is on the same side as where the retractable device is located ctil and the upper lift chamber is on the opposite side of a plunger. Preferably, the control valve is a three-way directional control valve. When a pressurized activation means such as compressed air enters the cylinder lift chamber, the piston with the piston rod moves down against the work surface and thus generates an upward force to lift and release the tool percussion with motor. During the lifting process, the spring is compressed. Once the directional control valve is switched to the disconnected position, the pressurized activation means is released from the cylinder lift chamber and the spring forces the piston rod to move up and retract, so that the motor percussion tool returns to the work surface.

According to an example that is useful for understanding the invention but which is not an embodiment of the invention, the actuator cylinder is a double acting cylinder having a lifting and retractable chamber. Preferably, the control valve is a four-way directional control valve. When the valve is actuated, the pressurized activation means is directed to the lifting chamber, the piston with the piston rod moves downward against the work surface and thus generates an upward force to lift and release the percussion tool with motor. During the lifting process, the pressurized activation means is released in the retractable chamber. When the pressurized activation means is directed to the retractable chamber, the piston rod moves up and retracts, and the motorized percussion tool returns to the work surface. During the retraction process, the pressurized activation means in the lifting chamber is released through an exhaust opening in the directional control valve.

In another embodiment, the control unit also contains a pressure regulator to control the pressure difference between the lifting and retracting chambers and, thus, adjusting the lifting height and the speed of the lifting operation under the combined weight. of the percussion tool with motor and the assisted lifting device.

In another embodiment, the control unit contains a flow control valve in place of a pressure regulator. The flow control valve is used to regulate the extension speed of the piston rod and, thus, the lifting speed for the motor percussion tool. The flow control valve can also be used to regulate the retraction speed. Optionally, the control unit may contain two flow control valves so that the lifting and retracting speeds can be handled independently.

In another additional embodiment, the control unit further contains a pressure regulator and a flow control. Thus, both the speed and the lifting height can be regulated as described above.

In yet another embodiment, the assisted lifting mechanism contains two actuator cylinders. The two actuator cylinders are arranged in such a way that a balance is provided for the lifting operation. Preferably, the two actuator cylinders are arranged symmetrically on the two sides of the percussion cylinder. The assisted lifting mechanism may have only one lifting foot that is connected to the outer end of the piston rod of each actuator cylinder. Alternatively, the assisted lifting mechanism may have two lifting feet so that each actuator cylinder has a lifting foot connected to the outer end of the piston rod.

In yet another embodiment, the motor percussion tool further includes a transport mechanism to facilitate transport. The transport mechanism contains at least one wheel. The wheel can be the lifting foot or the wheel can be connected to the lower body of the motorized percussion tool.

Brief description of the drawings

Figure 1 is a perspective view of a motorized percussion tool with an assisted lifting mechanism having an individual actuator cylinder.

Figure 2 is a cross-section of a motorized percussion tool with an assisted lifting mechanism having an individual actuator cylinder.

Figure 3 is a perspective view of a motorized percussion tool with an assisted lifting mechanism that has two actuator cylinders.

Figure 4 is a perspective view of a motorized percussion tool with an assisted lifting mechanism having an individual actuator cylinder and a transport mechanism containing two wheels fixed to the lower cylindrical body of the motorized percussion tool.

Figure 5 is an expanded sectional view of an actuator cylinder.

Figure 6 is a representation of the section of an individual actuator cylinder with a spring for use in the assisted lifting mechanism and to facilitate lifting and releasing the percussion tool with motor.

Figure 7 is a representation of the section of a double-acting cylinder for use in the assisted lifting mechanism and to facilitate the lifting and releasing of the motorized percussion tool (Figure 7 and the corresponding paragraph [0046] describe a example that is useful for understanding the invention but is not an embodiment of the invention).

Figures 8A, 8B and 8C are a schematic representation, a top view, and a side view of a three-way directional control valve with two positions, respectively.

Figures 9A and 9B are a schematic representation and a perspective view of a four-way directional control valve with two positions, respectively (Figures 9A and 9B and corresponding paragraphs [0047] and [0048] describe examples that are useful to understand the invention but which are not an embodiment thereof).

Figures 10A and 10B are a schematic representation of a perspective view and a sectional view of a four-way directional control valve with three positions, respectively (Figures 10A and 10B and the corresponding paragraph [0049] describe examples that are useful for understanding the invention but which are not an embodiment thereof).

Figure 11 is a cross-section of the alternative configurations A to D of the percussion cylinder and the assisted lifting cylinder of the motorized percussion tool together with the line 60-60 in Figure I.

Figure 12 is a cross-section of the alternative configurations A and B of the percussion cylinder and of the two assisted lift cylinders of the motorized percussion tool along line 70-70 in Figure 3.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a motor percussion tool 1 containing a percussion mechanism and an assisted lifting mechanism (Fig. 1 and 2). The motor percussion tool 1 is typically a pneumatic hammer or a rock drill, which is used to break rock, concrete, road pavement, such as asphalt and macadam, and dirt. The assisted lifting mechanism is used to mitigate the physical demands demanded by the operation of the heavy engine percussion tool 1 and facilitate lifting and removal.

In general, the percussion tool 1 with motor is a solid-shaped T-shaped machine with a series of different weights to adapt to a given application (Fig. 1). Similar to a conventional pneumatic hammer, the motorized percussion tool 1 has a vertical cylindrical body 10 with two handles 11 and two manual control levers (12 and 13) along the top. In the lower part, the motor percussion tool 1 has a working tool 14, such as a chisel or a drill, and a lifting foot 15. The percussion mechanism and the assisted lifting mechanism are integrated in a body 10 individual vertical cylindrical, which houses a percussion cylinder 20 for the percussion mechanism and at least one actuator cylinder 50 for the assisted lifting mechanism (Fig. 2). The first manual control lever 12 is connected to a butterfly valve 25 to control the operation of the percussion mechanism. The second manual control lever 13 is connected to a control unit 51 to manipulate the operation of the assisted lifting mechanism. Preferably, the first manual lever 12 is adjacent to a handle 11 while the second manual lever 13 is adjacent to the other handle 11.

Both the percussion mechanism and the assisted lifting mechanism can be put into operation by various types of energy, including pneumatic, hydraulic, independently or together. Preferably, both the percussion mechanism and the assisted lifting mechanism operate by an individual source of the activation means, such as compressed air. Typically, the pressurized activation means is supplied through a flexible tube 17 from the source of the pressurized activation means to an opening 16 of the activation means, which is located at the top of the vertical cylindrical body 10 and by under the handle 11, to provide power to both the percussion mechanism and the assisted lifting mechanism.

The percussion mechanism of the present invention can have various configurations to adapt to a particular application, such as a pneumatic hammer, also known as a hammer and rock drill. In an illustrative embodiment (Fig. 2), the percussion mechanism is actuated by a percussion cylinder 20, which is housed within the vertical cylindrical body 10. The percussion cylinder 20 contains a piston 21 within a diameter 23 of the upper cylinder and a sliding anvil 22 extending through a diameter 24 of the lower cylinder. The diameters, 23 and 24, of upper and lower cylinder are coaxial with each other. The work tool 14 is located under the sliding anvil 22, with the upper part housed within the second cylindrical diameter 24 and the lower end adapted to strike a work surface. The work tool 14 is fixed, so that it can be separated, to the bottom of the motor percussion tool 1.

To drive the plunger 20, a distribution system of the activation means is provided on the walls of the vertical cylindrical body 10, including a main conduit 31 on the upper end wall of the vertical cylindrical body 10, which is connected to the source of the pressurized activation means through a butterfly valve 25 and a conduit 35. The butterfly valve 25 is controlled by the manual control lever 12, branched conduits 32 and 33 are also provided through which the activation means it is transported to the upper chamber 26 and the lower chamber 27 of the cylindrical diameter 23, respectively. A switching mechanism 36 is also provided to control the flow of the activation means that alternatively closes the branched ducts 32 and 33. An exhaust duct 34 is provided on the side wall of the vertical cylindrical body 10, which is connected to both cylindrical diameters 23 and 24 with ambient air or atmosphere, to release the pressures that occur in cylindrical diameters 23 and 24 during operation.

During normal operation, the pressurized activation means first enters the upper chamber 26 of the cylindrical diameter 23 through the branched conduit 32. The pressure of the activation means forces the plunger 21 down to the sliding anvil 22. Next, The energy of the piston 21 when striking the anvil 22 is transferred to the work tool 14 which is underneath and which, in turn, is struck against the work surface. Once the piston 21 hits the anvil 22, the switching mechanism 36 is switched to disconnect the flow of the activation means that goes to the upper chamber 26 of the cylindrical diameter 23 by closing the branched conduit 32 and to redirect the flow to the chamber lower

27 opening the branched duct 33. Next, the pressure of the activation means brings the piston 21 back to the top of the cylindrical diameter 23. At the same time, the pressure in the upper chamber 26 of the diameter 23 of the cylinder is reduced by release the medium in the upper chamber 26 through the exhaust duct 34. Once the piston 21 reaches the upper part, the switching mechanism 36 automatically recoils and redirects the flow to the upper chamber 26 of the cylindrical diameter 23 and the piston 21 is lowered by the cylindrical diameter 23 so as to strike the anvil 22 and tool 14 work again. This sequence is repeated again and again while the control lever 12 is operated.

To minimize wear caused by the movement of the anvil 22 and the piston 21, the pressurized activation means is normally lubricated with an oil valve supplied from a reservoir (not shown), and which can be located in one of the handles 11.aduras 11. Less wear can be achieved by designing air mattresses on the top and bottom of the percussion cylinder 20 to prevent the piston 21 from hitting the ends of the cylinder 20.

In the present invention, the assisted lifting mechanism of the motor percussion tool 1 can also have various configurations as shown in Figs. 1, 3 and 4. The assisted lifting mechanism contains at least one actuator cylinder 50 and a control unit 51 in the upper part of the vertical cylindrical body 10 (Fig. 2). The control unit 51 contains at least one directional control valve. Preferably, the actuator cylinder 50 is housed within the vertical cylindrical body 10 and is parallel to the percussion cylinder 20. The actuator cylinder 50 contains a piston or piston 112 with an upper and lower part, operating within a

cylindrical diameter 114 (Fig. 2). Here, the terms "piston" and "plunger" are interchangeable and both mean the same. In addition, the cylinder 50 contains a piston rod 113 with an upper and lower end. The upper end of the piston rod 113 is fixed to the piston 112 while the lower end is optionally connected to the lifting foot 20. The lifting foot 15 can be attached to the piston rod 113 with a pin or screw. Fixing. The lifting foot 15 can also be screwed securely into the piston rod 113 with a threaded end. The lifting foot 15 can be of various shapes and sizes, including, but not limited to, bars, plates, cylinders, or wheels. The actuator cylinder 50 converts the power of the activation means to a linear force and moves the elevator foot 15 up and down.

The actuator cylinder 50 may be located in several positions in relation to the percussion cylinder 20 within the vertical cylindrical body 10, preferably, the lower end of the actuator cylinder 50 is near the lower end of the vertical cylindrical body 10 so that the length of the piston rod 113 of the actuator cylinder 50 is minimized. The actuator cylinder 50 can also have various diameter sizes and various stroke lengths. The actuator cylinder 50 may have an inside diameter of about 0.2 inches to about 10 inches (about 0.51 cm to about 25.4 cm) or about 0.5 inches to about 5 inches (about 1.27 cm to about 12.7 cm) with the preferred diameter of about 2.0 inches to about 2.75 inches (from about 5.08 to about 6.99 cm). In addition, the actuator cylinder 50 may be approximately 2 inches to approximately 30 inches (approximately 5.08 cm to approximately 76.2 cm) or approximately 5 inches to approximately 25 inches (approximately 12.7 cm to approximately 63.5 cm) with a preferred length of about 18 inches to about 20 inches (from about 45.7 cm to about 50.8 cm). The stroke of the actuator cylinder 50 may be approximately 1 inch to approximately 25 inches (approximately 2.54 cm to approximately 63.5 cm) or approximately 3 inches to approximately 20 inches (approximately 7.62 cm to approximately 50.8 cm) with a preferred length of about 16 inches to about 18 inches (from about 40.6 to about 45.7 cm). Also, various types of piston mounting elements can be used to improve performance and prolong life. For example, an adjustable cushion 130 may be provided to facilitate smooth stopping of the movement of the plunger (Fig. 5).

The actuator cylinder 50 of the assisted lifting mechanism is a single actuator cylinder 110 containing a retractable device 111 such as a regulating spring, a piston 112, and a piston rod 113, all arranged within a longitudinal diameter 114 (Fig. 6). The cylinder body 110 also contains an opening 115 of the activation means and an air opening 116. Preferably, the spring 111 is a compression spring and is located on the same side on which the piston rod 113 is positioned, as shown in Fig. 6. In an alternative embodiment, the spring 111 is a spring tensioner and is located on the other side of the piston 112. Therefore, the cylindrical diameter 114 is divided by the piston 112 into two chambers, a lifting chamber 117 and a retractable chamber 118 where the spring is located 111. The opening 115 of the activation means is located in the lifting chamber 117, which is on the opposite side of the spring 111, while the air opening 116 is located in the retractable chamber 118. The cylinder 110 single actuator uses the pressure of the activation means to provide the force in one direction to extend the piston rod 113 and the spring tension in the opposite direction to retract the piston rod 113.

A three-way directional control valve 311 is normally used to control the operation of the single actuator cylinder HO (Fig. 8). Generally, the directional control valve 311 has an inlet opening 313, an outlet opening 314, and an exhaust opening 315. To drive the piston 112, a system for distributing the activation means is provided on the walls of the vertical cylindrical body 10, including an inlet duct 37 on the wall of the upper end of the vertical cylindrical body 10, a duct 38 for transporting the means , and an exhaust duct 39. One end of the inlet duct 37 is connected through the duct 35 to the source of the pressurized activation means and the other end is connected to the inlet opening 313 of the

directional control valve. The medium transport conduit 38 is connected to the outlet opening 314 at one end and to the opening 115 of the activation means at the other end. The exhaust duct 39 is connected to the air opening 116 at one end and to the main exhaust duct 34 at the other end.

To extend the piston rod 113, the pressurized activation means, such as compressed air, is directed through the opening 115 of the activation means and is introduced into the lifting chamber 117 of the cylinder 110 through the conduit 38 The pressure acts on the upper surface of the piston 112, pushing the piston 112 down with the piston rod 113 and the foot 15 against the work surface to lift the percussion tool 1 with motor. During the lifting process, the spring 111 is compressed between the lower side of the piston 112 and the lower part of the cylindrical diameter 114.

To retract the piston rod 113, the directional control valve 311 is placed in the disconnected position and the pressure is released in the lifting chamber 117 of the cylinder 110. The spring tension forces the piston 112 to move up and , in this way, retract the piston rod 113. The activation means is free to flow from the lifting chamber 40 through the opening 115 of the activation means and the conduit 38, back through the control valve 311 to the return line in the hydraulic systems or the atmosphere in pneumatic systems. Typically, the air opening 116 of the cylinder 110 is expelled into the atmosphere through the ducts 39 and 34 to remove the air from the retractable chamber when the plunger drops and to introduce air into the retractable chamber when The plunger goes up.

In some embodiments, the three-way directional control valve 311 has two positions, that is, the normal position and the actuated position. When the valve 311 is in the actuated position, the inlet opening 313 and the outlet opening 314 are connected and, thus, the pressurized activation means flows to the lifting chamber 117 to push the piston 112 towards down with the piston rod 113 and the foot 15 against the work surface to lift the motor percussion tool 1. When the valve 311 is in normal position, the inlet opening 313 is blocked, the outlet opening 314 is connected to the exhaust opening 315, so that the pressurized activation means is released from the lifting chamber 117 and the tension of the spring forces the piston 112 to move upwards to retract the piston rod 113.

According to an example that is useful for understanding the invention but is not an embodiment thereof, the actuator cylinder 50 of the assisted lifting mechanism 3 is a double-acting cylinder 120 in which the pressurized activation means can be applied. on either side of the piston 112 to apply force and provide an upward movement and a downward movement (Fig. 7). Typically, the cylinder 120 contains a piston 112 and a piston rod 113, both arranged within a longitudinal diameter 114. The stroke of the piston 112 and the piston rod 113 in any direction is produced by the pressure of the activation means. . Cylinder 120 also contains two openings (121 and 122) of the activation means, one near each end of the cylinder, which can alternatively perform the function of inlet opening and outlet opening, depending on the direction of the flow being controlled. by the directional control valve. When a mismatched actuator cylinder 120 is used, which has two different effective work areas on the two sides of the piston 112, the cylinder 120 is normally installed so that the empty side of the piston 120 is used, which carries the largest load during the extension stroke of the piston rod, to perform the survey. The cylindrical diameter 114 is also divided by the piston 112 into two chambers with the lift chamber 123 at the top and the retractable chamber 124 at the bottom.

A four-way directional control valve 312 is normally used to control the operation of the double-acting cylinder 120 (Fig. 9). Typically, the directional control valve 312 has five openings, that is, an inlet opening 313, outlet openings 316 and 317, and exhaust openings 318 and 319. To drive the piston 112, a distribution system of the activation means is provided on the walls of the vertical cylindrical body 10, including an inlet duct 37 on the wall of the upper end of the vertical cylindrical body 10, two transport ducts 38 and 39 medium. One end of the inlet conduit 37 is connected through the conduit 35 to the source of the pressurized activation means and the other end is connected to the inlet opening 313 of the directional control valve 312. The medium transport conduit 38 is connected to the outlet opening 316 at one end and to the opening 121 of the activation means at the other end. The exhaust duct 39 is connected to the opening 122 of the activation means at one end and to the outlet opening 317 at the other end.

The directional control valve 312 can have two positions, the normal position and the actuated position (Fig. 9). The directional control valve 312 can be placed in the direct pressurized activation means at any end of the cylinder 120 and allows the displaced activation means to flow from the opposite end of the cylinder 120 through the control valve 312 to the control line. return in hydraulic systems or to the atmosphere in pneumatic systems. When the valve 312 is in the driven position, the inlet opening 313 is connected to the outlet opening 316 and, thus, the pressurized activation means flows to the lifting chamber 123 to push the piston 112 down with the piston rod 113 and the foot 15 against the work surface for lifting the motor percussion tool 1.

In this position, the outlet opening 317 is also connected to the exhaust opening 318 to release the activation means of the retractable chamber 124, when the valve 312 is in the normal position, the inlet opening 313 is � connected to the outlet opening 317 and, for this reason, the pressurized activation means flows to the retractable chamber 124 to remove the lifting foot 15. In this position, the outlet opening 316 is connected to the opening 319 Exhaust to allow the release of the activation means of the lift chamber 123.

The directional control valve can have three positions, an active right position to perform the survey, a central deactivation position, and an active left position to perform the retraction (Fig. 10). An example of a three-way, four-way directional valve 320 is shown in Fig. 8. The right active position is for the admission of the activation means to the lifting chamber (117 or 123), while the left active position It is for the release of the activation means of the lifting chamber (117 or 123). The central deactivation position provides a mechanism for maintaining the pressure of the lifting chamber (117 or 123) after the piston rod 113 is extended with the lifting foot 15. In this position, no activation means enters or exits the cylinder 50, and motor percussion tool 1 can be easily transported when the lifting foot 15 is a wheel or the like,

or the motor percussion tool 1 has a transport mechanism as shown in Fig. 4.

In some embodiments, the control unit 51 of the assisted lifting mechanism 3 further contains a pressure regulator 320 for manipulating the travel distance (extension) of the piston rod 113, hence the lifting height under the weight of the percussion tool 1 with motor. Here, the term "regulator of

pressure ”also includes a pressure reducing valve that provides a constant pressure at a lower pressure in the supply system. Preferably, the pressure regulator 320 is used to regulate the maximum pressure of the lifting chamber. The pressure regulator 320 may be located between the opening (115 or 121) of the activation means of the lifting chamber (117 or 123) and the directional control valve 310 or before the directional control valve. In operation, the pressure can be adjusted to such a level that a desired lifting height is achieved for a given application under the weight of the motor percussion tool 1. The lifting height is determined by the weight of the percussion tool 1 with motor and the difference in pressure between the two chambers. The greater the difference in pressure, the foot will travel a greater distance.

In some embodiments, the control unit 51 contains a flow control valve 330 instead of a pressure regulator 320. The flow control valve 330 is used to regulate the extension speed of the piston rod 113 and, therefore, the lifting speed. The flow control valve 330 may be placed before or after the directional control valve. When the flow control valve 330 is located after the directional control valve, only the lifting speed can be adjusted.

In some embodiments, the control unit further contains a pressure regulator 320 and a flow control 330. In this way, both the speed and the lifting height are regulated as described above.

The motor percussion tool 1 of the present invention is a combination of the percussion mechanism and the assisted lifting mechanism. In one embodiment, the assisted lifting mechanism 3 of the motor percussion tool 1 contains an actuator cylinder 50 and a control unit 51. The lifting foot 15 can also be in several locations in relation to the operator of the motorized percussion tool 1, which is determined by the relative positions of the percussion cylinder 20 versus the assisted lift cylinder 50. Some illustrative non-limiting configurations are shown in Fig. 11. Preferably, the lifting foot 15 is the configuration C in Fig.

11. For this reason, the lifting foot 15 is located between the operator and the motor percussion tool 1.

In another embodiment, the assisted lifting mechanism contains two actuator cylinders 50 and the control unit 51. Preferably, the two actuator cylinders 50 are configured so that a balance is provided during the lifting process. For example, the two actuator cylinders 50 may be placed symmetrically on the two sides of the vertical cylindrical body 10 of the motor percussion tool 1 (Fig. 12). The assisted lifting mechanism may have an individual lifting foot 15 connected to the outer end of the piston rod 113 of each actuator cylinder 50. Alternatively, the assisted lifting mechanism may have two lifting feet 15, each connected to the outer end of the piston rod 113 of each actuator cylinder 50.

In yet another embodiment, the motor percussion tool 1 further includes a transport mechanism 4 to facilitate the transport of the motor percussion tool 1. In one aspect, the lifting foot 15 is a wheel that serves as an assisted lifting mechanism and transport mechanism 4. In another aspect, the transport mechanism 4 has at least one wheel fixed to the bottom of the vertical cylindrical body 10. Preferably, the transport mechanism 4 has two wheels as shown in Fig. 4.

The motor percussion tool 1 of the present invention can have various heights and dimensions to suit a particular application. In one aspect, the motor percussion tool 1 has a weight not exceeding 200 pounds (90.7 kg), not exceeding 180 pounds (81.6 kg), not exceeding 160 pounds (72.6 kg), not exceeding 140 pounds (63.5 kg), not exceeding 120 pounds (54.4 kg), not exceeding 110 pounds (49.9 kg), or not exceeding 100 pounds (45.4 kg). In another aspect, the cylindrical body of the percussion tool 1 with motor has a width not exceeding approximately 16 inches (406 mm), not exceeding approximately 12 inches (305 mm), not exceeding 10 inches (254 mm), not exceeding 9 inches (229 mm), or not exceeding 8 inches (203 mm). In yet another aspect, the body of the percussion tool 1 with motor without a fixed working tool has a height not exceeding approximately 40 inches (1.02 m), not exceeding approximately 38 inches (0.97 m), not exceeding 36 inches (0.94 m), not exceeding 34 inches (0.86 m), or not exceeding 32 inches (0.81 m).

The motor percussion tool 1 with the assisted lifting mechanism can be operated in a wide range of pressures of approximately 50 psi to 200 psi (345 KPa to 1380 KPa). A typical operating pressure is about 70 psi to about 120 psi (483 KPa to about 827 KPa), more commonly about 90 psi (621 KPa). Normally, the percussion tool 1 with 5 motor can be operated in a temperature range of -40 �C to 70 �C. The percussion tool 1 with motor can have several weights, from 1 pound to 200 pounds (from 0.454 kg to 90.7 kg), from 5 pounds to 150 pounds (from 2.27 kg to 68 kg), or from 10 pounds at 120 pounds (from 4.54 kg to 54.4 kg). The percussion mechanism and the assisted lifting mechanism can operate at different pressures, although preferably at a similar pressure. Similar to the commercial pneumatic hammer, the percussion mechanism can operate at a pressure of approximately 85 psi

10 (586 KPa) and vary in consumption from 1.1 m3 to 2.1 m3 of air per minute, producing 1100 to 1500 strokes per minute.

The person skilled in the art will understand that several modifications can be made to the previous embodiments that are still within the scope of the invention described herein. The above description should not be considered as limiting but merely as illustrative of the preferred embodiments of the invention.

Claims (8)

one.

A percussion tool with integrated motor and assisted lifting (1), comprising:

5

an individual vertical body (10) comprising at least two integral longitudinal diameters, wherein a

first integral longitudinal diameter is a percussion diameter (23) and where a second diameter

Integral longitudinal is a first drive diameter (114);

a percussion plunger (21) contained within the percussion diameter (23) of the individual vertical body (10);

a work tool (14) fixed to the bottom of the percussion tool with motor and lift

assisted (1);

fifteen

a first lifting piston (112) contained within the first activation diameter (114) of the body (10)

individual vertical and dividing the first activation diameter (114) into a chamber (117) of higher elevation

and a lower retraction chamber (118);

a first rod (113) of the lifting piston connected to the first lifting piston (112) and extending

outside the first activation diameter (114) through an opening in the lower retraction chamber (118) and

extending out of the individual vertical body (10) through an opening in the vertical body (10)

individual, wherein the first rod (113) of the lifting piston further comprises an outer end;

a lifting foot (15) connected to the outer end of the first rod (113) of the lifting piston;

25

a control unit (51) comprising a directional control valve (310, 311, 312) having a

activation position and a deactivation position; and characterized by

it has a means of retracting the piston that provides a force maintained against the first piston

(112) in an upward direction when the control valve (310, 311, 312) is in the position

of disconnection and, therefore, keeps the lifting foot (15) in a retracted position when the tool

(14) work is engaged in a work surface;

wherein the first rod (113) of the lifting piston extends when the valve (310, 311, 312) of

35

control is in the activation position and therefore elevates the work tool (14) from the surface of

work, and where the first rod (113) of the lifting piston retracts when the valve (310, 311, 312)

of control is subsequently placed in the disconnected position and in which the means of retraction of the piston

comprises a retraction device (111) in the form of a compression spring or a tension spring, in

where the retraction device (111) is arranged in the first activation diameter (114).

2.

The percussion tool with integrated motor and assisted lifting (1) of claim 1, furthermore

it comprises a distribution system with a means of integral activation contained within the body (10)

individual vertical, comprising the distribution system with a means of integral activation:

Four. Five

a butterfly valve (25) that controls the flow of the pressurized activation means in the percussion diameter (23);

the control valve (310, 311, 312) having at least one normal position and one actuated position,

the control valve comprising an inlet opening (313), a first outlet opening (314, 316, 317), and

a first exhaust opening (315, 318, 319), wherein the control valve (310, 311, 312) controls the flow of the

pressurized activation means in the upper elevation chamber (117) of the first activation diameter (114);

a conduit (35) for entering the pressurized activation means in the communication of fluids with a source

of the pressurized activation means and connected to the butterfly valve (25) and the inlet opening (313)

of the control valve (310, 311, 312); Y

55

a first transport conduit (38) connecting the first opening (314, 316, 317) of the valve outlet

(310, 311, 312) control to the upper lift chamber (117) of the first activation diameter (114);

wherein when the control valve (310, 311, 312) is in the actuated position the opening (313) of

control valve inlet (310, 311, 312) communicates with the first outlet (314, 316, 317) outlet

of the control valve (310, 311, 312) and the pressurized activation means flows through the first conduit

(38) transport to the upper lift chamber (117).

3.

The percussion tool with integrated motor and assisted lifting (1) of claim 1, wherein the

65

First activation diameter (114) is cylindrical.

4. The percussion tool with integrated motor and assisted lifting (1) of claim 1, wherein the body (10) individual vertical also comprises a third interior of longitudinal diameter with respect to the individual vertical body (10), and wherein the third integral longitudinal diameter is a second activation diameter (114). 5. The percussion tool with integrated motor and assisted lifting (1) of claim 4, further comprising a second lifting piston (112), wherein the second lifting piston (112) is contained within the second diameter (114) activation of the individual vertical body (10). 6. The percussion tool with integrated motor and assisted lifting (1) of claim 5, wherein the The first activation diameter (114) and the second activation diameter (114) are located on opposite sides of the percussion diameter (23) and where the first activation diameter (114) and the second activation diameter (114) are Equn equidistant from the percussion diameter (23) 7. The percussion tool with integrated motor and assisted lifting (1) of claim 1, wherein the individual vertical body (10) is generally cylindrical. 8. The percussion tool with integrated motor and assisted lifting (1) of claim 7, wherein the percussion piston (21) is pneumatically operated, or 20 wherein the percussion piston (21) is hydraulically actuated, or wherein the percussion piston (21) is electrically actuated, or wherein the lifting piston (112) is pneumatically operated, or where the lifting piston (112) is hydraulically operated, or wherein the percussion piston (21) and the lifting piston (112) are operated independently, or 30 wherein the percussion piston (21) and the lifting piston (112) are actuated together, or wherein the percussion piston (21) and the lifting piston (112) are operated by means of individual activation. The percussion tool with integrated motor and assisted lifting (1) of claim 1, further comprising at least one handle (11) and two manual controls (12, 13), the handle (11) and the manual controls (12, 13) through the upper body (10). 10. Use of a percussion tool with integrated motor and assisted lifting (1) according to any of the 40 preceding claims for percussion purposes.